A process for the preparation of ethylidene diacetate and/or acetic acid anhydride by reacting methyl acetate and/or dimethyl ether with carbon monoxide or a mixture of carbon monoxide and hydrogen at elevated temperature and pressure characterized in that the reaction is carried out in the presence of a homogeneous catalyst system comprising a Group VIII noble metal compound, a bromide or iodide source, and a Group Va compound represented by the general formula
in which X is a Group Va element having a valency above 3 selected from N, P, As or Sb; Y is a Group Via element selected from 0, S, or Se and either a, b and c are 0 or 1 and R1, R2 and R3 are similar or dissimilar optionally substituted hydrocarbon groups; or a and b are 0 and c is 0 or 1 and R' and R2 form together with X a heterocyclic group; or a, b and c are 0 and R1, R2 and R3 form together with X a heterocyclic aromatic group.
一种通过
乙酸甲酯和/或二
甲醚与
一氧化碳或
一氧化碳和氢的混合物在高温高压下反应制备亚乙基二
乙酸酯和/或
乙酸酐的工艺,其特征在于该反应是在均相催化剂体系存在下进行的,该催化剂体系包括第八族贵
金属化合物,
溴源或
碘源,以及由通式表示的Va族化合物。
其中 X 是价数大于 3 的 Va 族元素,选自 N、P、As 或 Sb;Y 是选自 0、S 或 Se 的 Via 族元素,a、b 和 c 是 0 或 1,R1、R2 和 R3 是相似或不相似的任选取代的烃基;或 a 和 b 是 0,c 是 0 或 1,R'和 R2 与 X 一起形成杂环基;或 a、b 和 c 是 0,R1、R2 和 R3 与 X 一起形成杂环芳香基。